mojito5606
Posts: 17
Joined: Mon Sep 17, 2018 4:29 pm

Re: Regen question

Mon Dec 10, 2018 8:22 am

I always wonder does the L mode put any strain on the electric motor?

SeanNelson
Posts: 1434
Joined: Tue Jul 05, 2016 2:43 am
Location: Vancouver, BC

Re: Regen question

Mon Dec 10, 2018 3:35 pm

mojito5606 wrote:I always wonder does the L mode put any strain on the electric motor?

Nope.

GetOffYourGas
Posts: 1145
Joined: Tue Oct 20, 2015 5:25 pm
Location: Syracuse, NY

Re: Regen question

Tue Dec 11, 2018 3:57 pm

SeanNelson wrote:
mojito5606 wrote:I always wonder does the L mode put any strain on the electric motor?

Nope.


Well, technically yes it does put some strain on the motor. I mean, that is what is slowing down the car after all. But it is far less than normal acceleration. Nothing that's going to add noticeable wear-and-tear.
~Brian

EV Fleet:
2011 Torqeedo Travel 1003 electric outboard on a 22' sailboat
2012 Leaf SV (traded for Bolt)
2015 C-Max Energi (302A package)
2017 Bolt Premier

gpsman
Posts: 506
Joined: Thu Oct 20, 2016 9:10 pm

Re: Regen question

Sat Dec 15, 2018 5:44 am

Anyone ever have regen totally disabled?

I just did for the first time.

Was on a DCFC. Going on a long weekend trip. No one was waiting so I sat there and let it sit to go to 100%. It got to 100%. The car, the my chevy app, and the charger all said 100%. And it kept charging and charging and charging. For 30 minutes more at 6kw.

Usually it tapers fast. Even on a L2 it tapers from 6kw to 1 kw in about 15 minutes and then stops. I figured maybe it was doing cell balancing. It was 60 degrees so no cooling or heating was needed.

The voltage and SOC must have been extra high.
Normally pulling away “fully charged” I get 10 or 15 kw of regen. Enough to cautiously slow you down.
For the first time in 2 years and 25,000 miles I got nothing. When I let up on the pedal it was like coasting in neutral. A very wierd feeling for this car.

The icon was grey as usual, but the white line that moves was stacked on top of the other white line. After about 2 miles / 3 minutes the white line started moving down. This DCFC was also putting in 47 kw for an unusually long time also. Normally I don’t see more than 45 kw and maybe a flicker of 46 kw for a few seconds, but it PARKED at 47 kw for like 15 or 20 minutes. I wonder if the line voltage at the DCFC was a little higher than usual. Like some L2 are as low as 205 volts, 208 volts is average, 220 volts sometimes, 240 volts ocassionally, and 250 volts possibly. (The Bolt L2 can accept up to 266 volts without harm.)

SeanNelson
Posts: 1434
Joined: Tue Jul 05, 2016 2:43 am
Location: Vancouver, BC

Re: Regen question

Sun Dec 16, 2018 6:22 am

Yes - when you do a fast charge it takes 10 to 15 minutes to balance the cells (or whatever it's doing) after the display hits 100%. The battery management system deals with this, it doesn't matter what the voltage is (and in fact with a DC fast charger the car controls the voltage coming out of the charger). The long period of time at 100% is just a quirk of fast charging.

And yes, with a 100% charge you'll get little to no regen. It's usually a bit startling the first time you lift your foot off the "go" pedal but after that you just deal with it until you get some room in the battery.

NeilBlanchard
Posts: 332
Joined: Tue May 31, 2016 4:58 pm
Location: Massachusetts

Re: Regen question

Mon Dec 17, 2018 8:52 pm

I would love it, if we had a way to coast when you lift your right foot! As it is now, I put it in N when I need to coast, but this is not as easy as just lifting your foot - and you have to put it back in D to get any regen, even on the brake pedal.

I like regen - but only when I want to slow down. I hope that GM gives us an option to have no regen on the accelerator pedal in D.

SeanNelson
Posts: 1434
Joined: Tue Jul 05, 2016 2:43 am
Location: Vancouver, BC

Re: Regen question

Tue Dec 18, 2018 6:19 am

NeilBlanchard wrote:I would love it, if we had a way to coast when you lift your right foot! As it is now, I put it in N when I need to coast, but this is not as easy as just lifting your foot - and you have to put it back in D to get any regen, even on the brake pedal.

I drive in "L" all the time - when I want to coast I just release pressure on the accelerator pedal to the point where my speed remains constant. Seems to work fine for me.

GetOffYourGas
Posts: 1145
Joined: Tue Oct 20, 2015 5:25 pm
Location: Syracuse, NY

Re: Regen question

Tue Dec 18, 2018 11:47 am

I'm with Neil here. When driving hundreds of miles, feathering the accelerator gets tiring.
~Brian

EV Fleet:
2011 Torqeedo Travel 1003 electric outboard on a 22' sailboat
2012 Leaf SV (traded for Bolt)
2015 C-Max Energi (302A package)
2017 Bolt Premier

SeanNelson
Posts: 1434
Joined: Tue Jul 05, 2016 2:43 am
Location: Vancouver, BC

Re: Regen question

Tue Dec 18, 2018 6:30 pm

GetOffYourGas wrote:I'm with Neil here. When driving hundreds of miles, feathering the accelerator gets tiring.

Just hasn't been an issue for me. I had problems with doing it in my Prius C because the accelerator pedal had such a feather-light touch that maintaining a certain position was like holding my foot suspended in the air. But the Bolt has a healthier return spring, and I find that I can maintain pressure on the pedal for hours without any problems.

On long, relatively straight stretches (which tend to be the exception rather than the rule here in mountainous British Columbia) I tend to use cruise control if the traffic isn't too heavy. But I guess I'm never really in situations which require coasting for such a long time that using the pedal to control it is a problem. Coasting for a distance means going downhill, and I find that usually either means cruise control or having to slow down for curves pretty frequently.

GetOffYourGas
Posts: 1145
Joined: Tue Oct 20, 2015 5:25 pm
Location: Syracuse, NY

Re: Regen question

Tue Dec 18, 2018 9:08 pm

SeanNelson wrote:But I guess I'm never really in situations which require coasting for such a long time that using the pedal to control it is a problem. Coasting for a distance means going downhill, and I find that usually either means cruise control or having to slow down for curves pretty frequently.


I think this sums up the difference in our experiences. In the northeast, having long gradual downhill sections is fairly common, especially on highways like I-90.

Still, it wouldn't hurt you if freewheeling was available as an option. You don't have to use it if you don't like it.
~Brian

EV Fleet:
2011 Torqeedo Travel 1003 electric outboard on a 22' sailboat
2012 Leaf SV (traded for Bolt)
2015 C-Max Energi (302A package)
2017 Bolt Premier

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